Hello Linux Geeksters. Despite the initial talks about using Gnome 3.8 as the default Gnome version of Ubuntu 14.04 Trusty Tahr for stability reasons, in December 2013, Canonical has started the migration of Gnome 3.10 and GTK 3.10 to Ubuntu 14.04.
According to the mailing lists, Gnome Shell 3.10 has been already included to the Ubuntu 14.04 Trusty Tahr testing repositories, so most likely, GNOME 3.10 will be used by default on Ubuntu 14.04 Gnome. Now, the Ubuntu developers need to implement support for the GtkHeaderBar, for the integration of the title bar in the toolbar.
While Gnome 3.8 has been tested and updated a lot, meaning that it would have provided better security, by upgrading to Gnome 3.10, the Ubuntu GNOME 14.04 developers will be able to implement newer packages on the system, so this may have a good effect to the users.
Also, some Ubuntu developers have recently announced that Ubuntu 14.04 may be released with Qt 5.2 and GRUB 2.02 Beta 2.